from django.template import  loader
from django.shortcuts import render
from registration.models import Registration
from django.http import HttpResponse
from django.template import RequestContext


def login(request):
    t = loader.get_template('registration/login.html')

    return render(request, 'registration/login.html')

from django.conf.urls import patterns, include, url
from django.contrib import admin
admin.autodiscover()

    urlpatterns = patterns('',
        url(r'^polls/$', 'polls.views.index'),
        url(r'^polls/(?P<poll_id>d+)/$', 'polls.views.detail'),
        url(r'^polls/(?P<poll_id>d+)/results/$', 'polls.views.results'),
        url(r'^polls/(?P<poll_id>d+)/vote/$', 'polls.views.vote'),
        url(r'^admin/', include(admin.site.urls)),
        url(r'^registration/$', 'registration.views.login'),

from django.template import  loader
from django.shortcuts import render
from registration.models import Registration
from django.http import HttpResponse
from django.template import RequestContext

def login(request):
   t = loader.get_template('registration/login.html')
   if request.method == "POST":
    username = request.POST['user_name']
    password = request.POST['password']
    user = authenticate(username=username, password=password)
    if user is not None:
      if user.is_active:
        login(request, user)
        # success
        return render_to_response(request,'registration/login.html')

def login(request):
   # t = loader.get_template('registration/login.html') - not needed
   if request.method == "POST":
    username = request.POST.get('user_name')
    password = request.POST.get('password')
    user = authenticate(username=username, password=password)
    if user is not None:
      if user.is_active:
        login(request, user)
        # success
        return render(request,'registration/login.html')
      else:
        # user was not active
        return redirect('registration/')
    else:
        # not a valid user
        return redirect('registration/')
   else:
       # URL was accessed directly
       return redirect('registration/')

def loginto(request):
    if request.method == "POST":
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user is not None:
        if user.is_active:
           login(request, user)
           return render_to_response('index1.html')
        else:
           return render_to_response('error1.html')
        else:
        return render_to_response('error2.html')
    else:
        return render_to_response('error2.html')

url(r'^login', 'mytests.views.loginto', name='loginto'),

<form method="POST" action="{% url loginto %}">
  Username: <input type="text" name="username" size="15" /><br />
  Password: <input type="password" name="password" size="15" /><br />
  <div align="center">
    <p><input type="submit" value="Login" /></p>
  </div>
</form>